SCIENCE GRADE 6

fulcrum
effort
friction
a and b

crowbar
hockey bat
ice holder
manual broom

manual broom
seesaw
hockey bat
coal holder

coal holder
scissors
seesaw
manual broom

third class levers
first class levers
second class levers
b and c

when the arm of force  .............. the arm of resistance the lever does not conserve effort 
is shorter than
is longer than
equals
a and c

metre
centimeter
hertz
newton

which of the following levers saves effort
scissors
fishing tool
nutcracker
sweet holder

when the effort force =20 Newton , resistance is 8 Newton and effort force arm =4 cm, so the resistance arm equals
30
40
50
60

the types of lever which sometimes has a mechanical benefitis the 
first class levers
second class levers
third class levers
fourth class levers

when the effort arm equals 5 cm and resistancearm equals 10 cm so
lever may be first class
effort force > rersistance
lever may be third class
a , b and c

when the arm of force =4cm and the arm of resistance = 4 cm so 
effort force = resistance force
effort force > resistance force
effort force < resistance force
effort arm > resistance force

the most common simple machines are 
levers
bicycles
car machines
a , b and c

the lever rotates around a fixed point called 
resistance force
effort force
fulcrum
a rigid bar

which of the following levers moves force from one place to another
wheel barrow
nutcracker
manual broom
pincers

soda water opener is a 
first class
second class
third class
fourth class

is a lever from the third order
scissors
nutcracker
nail clippers
sweet holder

the first class lever differs from the second class lever in 
absence of the effert force
presence of a fixed point
the position of fulcrum
a and b

the types of levers which always doesnot save effort force
first class lever
second class lever
third class lever
fourth class lever

- the boy whose weight is 250 Newton sits on a seesaw at 3 metres from the fulcrum where a 150  Newton girl must sit to balance the seesaw
3m
5m
7m
9m